80 lines
2.5 KiB
Bash
Executable File
80 lines
2.5 KiB
Bash
Executable File
#!/usr/bin/env bash
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set -Euo pipefail
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VERBOSE=false
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SHOW_TRACE_OPT=""
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# Parse options
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if [[ "$1" == "-v" || "$1" == "--verbose" ]]; then
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VERBOSE=true
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SHOW_TRACE_OPT="--show-trace"
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shift # Remove the verbose flag from arguments
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fi
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# Check if hostname argument is provided
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if [ "$#" -ne 1 ]; then
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echo "Usage: $0 [-v|--verbose] <hostname>" >&2
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exit 1
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fi
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HOSTNAME="$1"
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# Check if 'nix-instantiate' command is available
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if ! command -v nix-instantiate > /dev/null; then
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echo "ERROR: 'nix-instantiate' command not found. Please ensure Nix is installed and in your PATH." >&2
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exit 1
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fi
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# Determine the absolute directory where the script itself is located
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SCRIPT_DIR=$(dirname "$(readlink -f "$0")")
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# Construct the absolute path to the host's configuration file
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# and resolve it to a canonical path
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CONFIG_PATH=$(readlink -f "$SCRIPT_DIR/../hosts/$HOSTNAME/configuration.nix")
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# Verify that the CONFIG_PATH exists and is a regular file
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if [ ! -f "$CONFIG_PATH" ]; then
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echo "ERROR: Configuration file not found at '$CONFIG_PATH' for host '$HOSTNAME'." >&2
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exit 1
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fi
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# Check for host-specific channel file
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CHANNEL_PATH="$SCRIPT_DIR/../hosts/$HOSTNAME/channel"
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CHANNEL_OPT=""
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if [ -f "$CHANNEL_PATH" ]; then
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CHANNEL_URL=$(cat "$CHANNEL_PATH")
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# Append /nixexprs.tar.xz to get the actual tarball URL
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TARBALL_URL="${CHANNEL_URL}/nixexprs.tar.xz"
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echo "INFO: Using channel '$TARBALL_URL' from '$CHANNEL_PATH'."
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CHANNEL_OPT="-I nixpkgs=$TARBALL_URL"
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else
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echo "WARNING: No channel file found at '$CHANNEL_PATH'. Using system default." >&2
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fi
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echo "INFO: Attempting dry-build for host '$HOSTNAME' using configuration '$CONFIG_PATH'..."
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if [ "$VERBOSE" = true ]; then
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echo "INFO: Verbose mode enabled, --show-trace will be used."
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fi
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# Execute nix-instantiate to evaluate the configuration
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# nix-instantiate fetches fresh tarballs and catches all evaluation errors
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# unlike nixos-rebuild which may use cached results
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NIX_OUTPUT_ERR=$(nix-instantiate $SHOW_TRACE_OPT $CHANNEL_OPT -I nixos-config="$CONFIG_PATH" '<nixpkgs/nixos>' -A system 2>&1)
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NIX_EXIT_STATUS=$?
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# Check the exit status
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if [ "$NIX_EXIT_STATUS" -eq 0 ]; then
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echo "INFO: Dry-build for host '$HOSTNAME' completed successfully."
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if [ "$VERBOSE" = true ]; then
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echo "Output from nix-instantiate:"
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echo "$NIX_OUTPUT_ERR"
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fi
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exit 0
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else
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echo "ERROR: Dry-build for host '$HOSTNAME' failed. 'nix-instantiate' exited with status $NIX_EXIT_STATUS." >&2
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echo "Output from nix-instantiate:" >&2
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echo "$NIX_OUTPUT_ERR" >&2
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exit "$NIX_EXIT_STATUS"
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fi
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